Cook County, IL
County15432 species observed across 5 groups · Pop. 5.3M
Ecoregions
Species observed
Increased Seasonal Activity
Currently Flowering
Birds· 529 species
Mammals· 111 species
Plants· 4891 species
Reptiles & Amphibians
Fish
Insects· 8802 species
Other Invertebrates· 1099 species
Fungi & Lichens
Explore nearby
Part of
StateIllinoisPop. 12.8MCities in Cook County
Alsip, ILPop. 19.0KArlington Heights, ILPop. 77.4KBarrington, ILPop. 10.7KBartlett, ILPop. 41.0KBellwood, ILPop. 18.7KBensenville, ILPop. 18.8KBerwyn, ILPop. 57.0KBlue Island, ILPop. 22.5KBridgeview, ILPop. 17.0KBrookfield, ILPop. 19.4KBuffalo Grove, ILPop. 43.1KBurbank, ILPop. 29.3KBurr Ridge, ILPop. 11.2KCalumet City, ILPop. 35.9KChicago Heights, ILPop. 27.4KChicago, ILPop. 2.7MChicago Ridge, ILPop. 14.4KCicero, ILPop. 84.9KCountry Club Hills, ILPop. 16.7KCrestwood, ILPop. 10.8KDeerfield, ILPop. 19.2KDes Plaines, ILPop. 60.5KDolton, ILPop. 21.3KElgin, ILPop. 114.6KElk Grove Village, ILPop. 32.7KElmhurst, ILPop. 45.7KElmwood Park, ILPop. 24.4KEvanston, ILPop. 77.8KEvergreen Park, ILPop. 19.9KForest Park, ILPop. 14.3KFrankfort, ILPop. 20.3KFranklin Park, ILPop. 18.4KGlenview, ILPop. 48.5KHanover Park, ILPop. 37.3KHarvey, ILPop. 20.3KHazel Crest, ILPop. 13.3KHickory Hills, ILPop. 14.5KHinsdale, ILPop. 17.4KHoffman Estates, ILPop. 52.4KHomer Glen, ILPop. 24.5KHomewood, ILPop. 19.4KJustice, ILPop. 12.6KLa Grange, ILPop. 16.3KLa Grange Park, ILPop. 13.4KLansing, ILPop. 29.0KLemont, ILPop. 17.8KLincolnwood, ILPop. 13.4KLyons, ILPop. 10.8KMarkham, ILPop. 11.6KMatteson, ILPop. 19.0KMaywood, ILPop. 23.4KMelrose Park, ILPop. 24.7KMidlothian, ILPop. 14.3KMorton Grove, ILPop. 25.2KMount Prospect, ILPop. 56.7KNiles, ILPop. 30.8KNorridge, ILPop. 15.2KNorthbrook, ILPop. 35.1KNorthlake, ILPop. 12.8KOak Forest, ILPop. 27.4KOak Lawn, ILPop. 58.1KOak Park, ILPop. 54.4KOrland Park, ILPop. 58.5KPalatine, ILPop. 67.7KPalos Heights, ILPop. 12.0KPalos Hills, ILPop. 18.5KPark Forest, ILPop. 21.6KPark Ridge, ILPop. 39.5KProspect Heights, ILPop. 16.0KRichton Park, ILPop. 12.7KRiverdale, ILPop. 10.6KRiver Forest, ILPop. 11.7KRiver Grove, ILPop. 10.6KRolling Meadows, ILPop. 24.1KRoselle, ILPop. 22.9KSchaumburg, ILPop. 78.4KSchiller Park, ILPop. 11.7KSkokie, ILPop. 67.7KSouth Holland, ILPop. 21.4KStreamwood, ILPop. 39.4KSummit, ILPop. 11.1KTinley Park, ILPop. 55.8KWestchester, ILPop. 16.8KWestern Springs, ILPop. 13.6KWheeling, ILPop. 39.2KWilmette, ILPop. 28.1KWinnetka, ILPop. 12.7KWoodridge, ILPop. 34.1KWorth, ILPop. 10.9K